CVE-2018-6921 — In FreeBSD before 11.1-STABLE(r332066) and 11.1-RELEASE-p10, due to insufficient initialization of memory copied to userland in the network subsystem, small amounts of kernel memory may be disclosed to userland processes

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MEDIUM

In FreeBSD before 11.1-STABLE(r332066) and 11.1-RELEASE-p10, due to insufficient initialization of memory copied to userland in the network subsystem, small amounts of kernel memory may be disclosed to userland processes

Published May 8, 2018

5.5

MEDIUM

CVSS 3.0

EPSS 0.31%

Description

In FreeBSD before 11.1-STABLE(r332066) and 11.1-RELEASE-p10, due to insufficient initialization of memory copied to userland in the network subsystem, small amounts of kernel memory may be disclosed to userland processes. Unprivileged authenticated local users may be able to access small amounts of privileged kernel data.

Affected products

Vendor FreeBSD Product FreeBSD Default
n/a
- Version
  FreeBSD 11.x prior to 11.1-RELEASE-p10.
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

FreeBSD

n/a

Version	Status	Constraints
FreeBSD 11.x prior to 11.1-RELEASE-p10.	affected	-

Remediation

No remediation recorded yet.

Metrics

0.31% 0.00313

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00313

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (8 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	0.31% (0.00313)	21.88th	v5 (v2026.06.15)
Sep 20, 2026	0.31% (0.00313)	24.40th	v5 (v2026.06.15)
Jul 20, 2024	0.04% (0.00042)	5.06th	v3 (v2023.03.01)
Mar 7, 2023	0.04% (0.00042)	5.63th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.33% (0.00332)	3.01th	v5 (v2026.06.15)
Apr 14, 2021	0.33% (0.00332)	0.00th	v1

Weaknesses (1)

CWE-200

Exposure of Sensitive Information

References (2)

http://www.securityfocus.com/bid/104118
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-EN-18:05.mem.asc
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
http://www.securityfocus.com/bid/104118		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-EN-18:05.mem.asc		x_refsource_CONFIRMVendor Advisory